Amazon Prime Video is able to remove a video from your library after purchase.
We are contacting you regarding a past Prime Video purchase(s). The below content is no longer playable on Prime Video.
In an effort to compensate you for the inconvenience, we have applied a £5.99 Amazon Gift Card to your account. The Gift Card amount is equal to the amount you paid for the Prime Video purchase(s). To apologize for the inconvenience, we've also added an Amazon Gift Certificate of £5 to your account. Your Gift Card balance will be automatically applied to your next eligible order. You can view your balance and usage history in Your Account here:
Same with games. One day a purchase vanished off my PlayStation library, and I must have deleted the email cause it was an old purchase. I still have the save files but they won't refund or give me back the game cause it vanished off their records
I'm quite happy that at least steam doesn't wipe (as to my knowledge) a game from their servers, yes they can remove it from the store front, but if you bought it you can still download and play it